Michael Cannon could be described as a leading opponent of Obamacare, and now he’s joining the chorus of voices taking issue with the flimsy reasoning behind the latest attempt to kill the law.

To provide some perspective, Cannon, a health policy analyst at the libertarian Cato Institute, was the guy I called when I was writing my book Overcoming Obamacare and wanted somebody who would make the case for the purest form of free-market health insurance. He argued for completely repealing Obamacare and moving to a system in which individuals and employers would be able to invest in tax-free large health savings accounts.